阳关大桥设计

ABSTRACTIn this design,according to the topography and project requirements and on thebasis of the current highway bridge design specifications,the author put forward twoschemes,prestressed concrete continuous girder bridges and continuous rigid-framestructure of prestressed concrete.In adherence to bridge design principles,"practical,economical,safe and good-looking",prestressed concrete continuous girder bridges of46m+76m +46m were finally chosen as the recommended designing model aftervarious comparison and selection.The design made full use of Midas to conduct the structural analysis.It built up thebasic model of the bridge taki consideration of the expected size,and then took theanalysis of internal force and calculated reinforcement results,accomplishing actualconstruction analysis of every phase as well as cross section checking.Meanwhile,during the process,elements including creep and shrinkage of concrete,creep secondaryinternal force and temperature secondary internal force should also be taken intoaccount.The design mainly focused on the upper structure design of prestressed concretecontinuous girder bridges.Major tasks completed in the design were the overall bridgelayout,set of the structure size,calculation of bridge load internal force,estimation andarrangement of bridge prestressed steel beam,check of loss and stress of bridge prestress,secondary internal force,internal force combination and cross section stress of mainbeam,and design of the bridge construction.Finally,the analysis showed that the design calculation method was right andscientific with rational internal force distribution.Thus it fully complied with projectrequirements.KEY WORDS:selection scheme,continuous girder bridge,Midas,structural analysis,checking computations共78页第2页